Oh McKinsey had a name for that program ("Leap"). I once worked at a "Telco Enterprise Startup" in Berlin founded by them.
They essentially lied about any anticipated KPI potentials and let their "tech" people put together a 15k EUR/month (before public release) platform on AWS which was such a pile of mess, it made the second year's CTO start from scratch. After some heavy arguments because of their poor performance, McKinsey agreed to let some "non-technical" people work there for a couple of months for free. All arguments you'd had with the McKinsey "Engineers" felt like talking to AWS Sales, they had barely any technical insights but a catalog of "pre-made solutions" to choose from.
What I'm trying to say is that these two do not represent the German political landscape at all. They also, while on different ends of the left-right-spectrum, both only represent the pro-Russian minority of the German political landscape. This is not a debate happening in Germany right now and no other party has expressed support of any position.
You're basically falling into "the populist trap" in which they take a fact or something true and wrap it with a lot of BS and conspiracy theories. If you disregard the true core "just because it's from the wrong party" you give them political lever. We've seen that playbook working out for 10+ years.
De Masi did a great job as a financial expert in a parliamentary group, highly regarded by people over the whole political spectrum. I don't understand why he joined BSW but that doesn't weaken his point here.
And since we're already publicly discussing Trump blackmailing us with decommissioning US IT-Services without further notice, it is exactly right to talk about assets like gold being stored on US soil.